package com.dingding.manager.modules.system.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
* @ClassName: CaptchaController 
* @Description: kaptcha 验证码 （登录图片验证码controller）
* @author SUNZHICHENG 
* @date 2017年1月6日 上午11:31:48 
* @version V2.6.3
 */

@Controller
@RequestMapping(value="sys/kaptcha")
public class CaptchaController {
	
	@Autowired
	private Producer captchaProducer = null;
	
	/**
	 * @Description:生成图片验证码 
	 * @date 2017年1月6日 上午11:32:53
	 * @author SUNZHICHENG 
	 * @throws IOException 
	 * @since V2.6.3
	 */
	@RequestMapping(value="/captchaImage")
	public ModelAndView getKaptchaImage(HttpServletRequest request ,HttpServletResponse response) throws IOException{
		 HttpSession session=request.getSession();
		 response.setDateHeader("Expires", 0);  
	     response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
	     response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
	     response.setHeader("Pragma", "no-cache");  
	     response.setContentType("image/jpeg");  
		
	     String capText = captchaProducer.createText();  
	     session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
	     
	     BufferedImage bi = captchaProducer.createImage(capText);  
	     ServletOutputStream out = response.getOutputStream();  
	     ImageIO.write(bi, "jpg", out);  
		try {  
            out.flush();  
        } finally {  
            out.close();  
        }  
		return null;
	}
	
}
